I recently bought some Montana spray paint caps and they don't work, I cant even push them down. Anyone know why? Thanks.

The paint I'm using is Montana Black. The caps that don't work are the level 4, the level 6, and the universal. When I put them on the can I tried to push them down but they wouldn't move at all. I bought four of each cap so I don't think its just a defective one. The straw piece on the caps mentioned above seems shorter then on the caps that work so I'm wondering if its not going all the way into the can. Thanks for your help.

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